Thermostat



FIG. 1 is a front perspective view of a thermostat of the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof, the bottom plan view being a mirror image thereof;

FIG. 4 is a front elevational view thereof, the difference being the change in environment; and,

FIG. 5 is a side elevational view thereof, the opposite side being a mirror image thereof.

The broken line showing of the environment is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a thermostat, as shown and described. 